听下面一段材料，回答第1至3题。 1. How many chemical changes take place in the brain? A. 10 000 every second. B. 6 000 000 every minute. C. 100 000 every s-高中英语-n多题

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听下面一段材料，回答第1至3题。

1. How many chemical changes take place in the brain?

A. 10 000 every second.
B. 6 000 000 every minute.
C. 100 000 every second.

2. How can the brain keep its power?

A. To increase the amount of research done on the brain.
B. To say exactly what each part of the brain does.
C. To give it plenty of exercise.

3. Which of the following is TRUE according to recent research?

A. We can remember everything that happens to us.
B. The power of one's brain gets weaker as one grows older.
C. We should use our brain less so that it can work better.

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